Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 21894 |
| Seitenumfang | 16 |
| Fachzeitschrift | Scientific Reports |
| Jahrgang | 12 |
| Ausgabenummer | 1 |
| Frühes Online-Datum | 19 Dez. 2022 |
| Publikationsstatus | Veröffentlicht - Dez. 2022 |
Abstract
Understanding climate variability and stability under extremely warm ‘greenhouse’ conditions in the past is essential for future climate predictions. However, information on millennial-scale (and shorter) climate variability during such periods is scarce, owing to a lack of suitable high-resolution, deep-time archives. Here we present a continuous record of decadal- to orbital-scale continental climate variability from annually laminated lacustrine deposits formed during the late Early Cretaceous (123–120 Ma: late Barremian–early Aptian) in southeastern Mongolia. Inter-annual changes in lake algal productivity for a 1091-year interval reveal a pronounced solar influence on decadal- to centennial-scale climatic variations (including the ~ 11-year Schwabe cycle). Decadally-resolved Ca/Ti ratios (proxy for evaporation/precipitation changes) for a ~ 355-kyr long interval further indicate millennial-scale (~ 1000–2000-yr) extreme drought events in inner-continental areas of mid-latitude palaeo-Asia during the Cretaceous. Millennial-scale oscillations in Ca/Ti ratio show distinct amplitude modulation (AM) induced by the precession, obliquity and short eccentricity cycles. Similar millennial-scale AM by Milankovitch cycle band was also previously observed in the abrupt climatic oscillations (known as Dansgaard–Oeschger events) in the ‘intermediate glacial’ state of the late Pleistocene, and in their potential analogues in the Jurassic ‘greenhouse’. Our findings indicate that external solar activity forcing was effective on decadal–centennial timescales, whilst the millennial-scale variations were likely amplified by internal process such as changes in deep-water formation strength, even during the Cretaceous ‘greenhouse’ period.
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in: Scientific Reports, Jahrgang 12, Nr. 1, 21894, 12.2022.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Decadal–centennial-scale solar-linked climate variations and millennial-scale internal oscillations during the Early Cretaceous
AU - Hasegawa, Hitoshi
AU - Katsuta, Nagayoshi
AU - Muraki, Yasushi
AU - Heimhofer, Ulrich
AU - Ichinnorov, Niiden
AU - Asahi, Hirofumi
AU - Ando, Hisao
AU - Yamamoto, Koshi
AU - Murayama, Masafumi
AU - Ohta, Tohru
AU - Yamamoto, Masanobu
AU - Ikeda, Masayuki
AU - Ishikawa, Kohki
AU - Kuma, Ryusei
AU - Hasegawa, Takashi
AU - Hasebe, Noriko
AU - Nishimoto, Shoji
AU - Yamaguchi, Koichi
AU - Abe, Fumio
AU - Tada, Ryuji
AU - Nakagawa, Takeshi
N1 - Funding Information: The authors thank A. Yamamoto, A. Abe-Ouchi, I. Kitaba, K. Nagashima, and H. Kitagawa for discussions. They also grateful to Dr. Weedon G. P., two anonymous reviewers, and Editor Dr. Boulila S., for their fruitful comments. This work was funded by JSPS Grant-in-Aid for Scientific Research (B) (19H04256, 25302011), Young Scientific Research (B) (16K21095), and Project for Solar–Terrestrial Environment Prediction (16H01173). This study was also supported by cooperative research program at Center for Advanced Marine Core Research (CMCR), Kochi University (No. 19A017, 19B017, 20A027, 20B024, 21A037, 21B035).
PY - 2022/12
Y1 - 2022/12
N2 - Understanding climate variability and stability under extremely warm ‘greenhouse’ conditions in the past is essential for future climate predictions. However, information on millennial-scale (and shorter) climate variability during such periods is scarce, owing to a lack of suitable high-resolution, deep-time archives. Here we present a continuous record of decadal- to orbital-scale continental climate variability from annually laminated lacustrine deposits formed during the late Early Cretaceous (123–120 Ma: late Barremian–early Aptian) in southeastern Mongolia. Inter-annual changes in lake algal productivity for a 1091-year interval reveal a pronounced solar influence on decadal- to centennial-scale climatic variations (including the ~ 11-year Schwabe cycle). Decadally-resolved Ca/Ti ratios (proxy for evaporation/precipitation changes) for a ~ 355-kyr long interval further indicate millennial-scale (~ 1000–2000-yr) extreme drought events in inner-continental areas of mid-latitude palaeo-Asia during the Cretaceous. Millennial-scale oscillations in Ca/Ti ratio show distinct amplitude modulation (AM) induced by the precession, obliquity and short eccentricity cycles. Similar millennial-scale AM by Milankovitch cycle band was also previously observed in the abrupt climatic oscillations (known as Dansgaard–Oeschger events) in the ‘intermediate glacial’ state of the late Pleistocene, and in their potential analogues in the Jurassic ‘greenhouse’. Our findings indicate that external solar activity forcing was effective on decadal–centennial timescales, whilst the millennial-scale variations were likely amplified by internal process such as changes in deep-water formation strength, even during the Cretaceous ‘greenhouse’ period.
AB - Understanding climate variability and stability under extremely warm ‘greenhouse’ conditions in the past is essential for future climate predictions. However, information on millennial-scale (and shorter) climate variability during such periods is scarce, owing to a lack of suitable high-resolution, deep-time archives. Here we present a continuous record of decadal- to orbital-scale continental climate variability from annually laminated lacustrine deposits formed during the late Early Cretaceous (123–120 Ma: late Barremian–early Aptian) in southeastern Mongolia. Inter-annual changes in lake algal productivity for a 1091-year interval reveal a pronounced solar influence on decadal- to centennial-scale climatic variations (including the ~ 11-year Schwabe cycle). Decadally-resolved Ca/Ti ratios (proxy for evaporation/precipitation changes) for a ~ 355-kyr long interval further indicate millennial-scale (~ 1000–2000-yr) extreme drought events in inner-continental areas of mid-latitude palaeo-Asia during the Cretaceous. Millennial-scale oscillations in Ca/Ti ratio show distinct amplitude modulation (AM) induced by the precession, obliquity and short eccentricity cycles. Similar millennial-scale AM by Milankovitch cycle band was also previously observed in the abrupt climatic oscillations (known as Dansgaard–Oeschger events) in the ‘intermediate glacial’ state of the late Pleistocene, and in their potential analogues in the Jurassic ‘greenhouse’. Our findings indicate that external solar activity forcing was effective on decadal–centennial timescales, whilst the millennial-scale variations were likely amplified by internal process such as changes in deep-water formation strength, even during the Cretaceous ‘greenhouse’ period.
UR - http://www.scopus.com/inward/record.url?scp=85144255452&partnerID=8YFLogxK
U2 - 10.1038/s41598-022-25815-w
DO - 10.1038/s41598-022-25815-w
M3 - Article
C2 - 36536054
AN - SCOPUS:85144255452
VL - 12
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
IS - 1
M1 - 21894
ER -